JPH06335842A - Method for correcting feed quantity of boring tool feeding mechanism by image processing - Google Patents

Abstract

PURPOSE:To precisely compute the correcting ratio with the substantial moving distance between holes of a boring tool to the theoretical distance between positions to be bored by using image processing. CONSTITUTION:Every time when an original point and a position to be bored are bored by a boring tool 6 moving just under a plurality of positions to be bored provided with a specific interval from an optional original point on a target material through an XY-axial feeding mechanism 5, the hole is photographed by a photographing part 3, and a variable density image signal is binarized by an image processing part 2. The binarized data is stored in an image memory 22, the binarized data is housed in a monitor 4 screen, and the center-of-gravity measurement of the binarized data is also conducted to measure the center of each hole. Each correction ratio of the substantial moving distance of the boring tool 6 between the holes to the theoretical distance between positions to be bored is calculated on the basis of a specific operation expression of a storing part 42 provided with the operation expression, and the correcting ratio is stored to form the parameter to a control means 7 of the XY-axial feeding mechanism 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting the feed amount of a feed mechanism for punches by image processing.

[0002]

2. Description of the Related Art Since a reference hole is formed in a printed circuit board or the like, target marks printed with copper foil are provided at four corners, and the printed circuit board is provided with a moving mechanism so that each target mark is located immediately below a photographing section. Along with the movement of the target mark, the center of the target mark is measured by a predetermined means, and the perforation tool (drill) is finely moved in the X and Y directions by the X and Y axis feeding mechanism by an error amount from the measured center. Then, the center of the punch (drill) is aligned with the center of the target mark, and the punch (drill) is raised from that position to form a reference hole with the center of the target mark as the core.

[0003]

By the way, the X- and Y-axis feeding mechanism of the punching tool actually punches the punching tool due to the feeding error of the bolt screw or the belt even if the control means is instructed to perform the feeding according to the theoretical value. There was a problem in that the tool could not be moved exactly according to the theoretical value and the drilling position accuracy was poor. Conventionally, in order to correct the poor feed accuracy, the actual feed amount for each theoretical feed amount of the punch is measured using a measuring machine, and the measured value is used as a parameter for the feed mechanism control means. I remember. However, it requires a laborious and cumbersome work of manually measuring with a measuring machine,
Not only was it inefficient, but the measurement accuracy was not good either.

The present invention has been made in view of the conventional circumstances, and its technical problem is to perform image processing on the correction rate of the theoretical distance between the holes to be punched and the actual movement distance of the punching tool between the holes. Use it to get exactly.

[0005]

[Means for Solving the Problems] The technical means taken to achieve the above-mentioned object is to provide a plurality of perforation target sites directly below a plurality of perforations, which are attached to an object at regular intervals from an arbitrary origin via an X and Y axis feeding mechanism. Every time the moving punch is used to punch the origin and the target area, the hole is photographed by the photographing unit, the grayscale image signal is binarized by the image processing unit, and the binarized data is stored in the image memory. The binarized data is stored in the monitor screen, and the center of gravity of the binarized data is measured to measure the center of each hole, and the actual movement distance of the punching tool between the holes with respect to the theoretical distance between the target holes. And the respective correction factors are calculated based on the calculation formulas of the storage unit that stores the predetermined calculation formulas, and the correction factors are stored and used as parameters for the control means of the X and Y axis feed mechanism. That is the summary.

[0006]

According to the above-mentioned technical means, the correction ratio between the theoretical distance between the holes to be punched and the actual movement distance of the punching tool between the holes, which is used as a parameter for the control means of the X and Y axis feeding mechanism, can be obtained. Accordingly, for example, the center of the target mark is measured by a desired means, and the punching tool is moved by the amount of the error through the X and Y axis feeding mechanism so as to be located immediately below the center of the measurement,
In the case where fine movements (correction movements) have to be made in the X and Y directions, the theoretical feed distance of the X and Y axis feed mechanism is stored as a parameter and is the theoretical distance between the drilling sites that matches the feed amount. It is possible to accurately position the perforating tool under the center of the target mark by making a correction with the correction rate of.

[0007]

As described above, according to the present invention, the correction ratio between the theoretical distance between the holes to be punched and the actual movement distance of the punching tool between the holes is calculated by the image processing as described above, and the correction rate of several patterns thereof is calculated. Is stored as a parameter to the control means of the X- and Y-axis feed mechanism, and the actual movement distance of the punch can be corrected each time based on the parameter. It is possible to easily obtain an accurate correction rate without performing the complicated work such as the prior art of measuring the feed amount of the sheet using a measuring machine.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 3 show an apparatus and a flow chart for executing a feed amount correction method of a feed mechanism for a punching tool by image processing of this embodiment.

In FIG. 1, reference numeral 1 is a printed circuit board to be punched, and target marks 11 for punching reference holes are provided at four corners. The target mark 11 is made of copper foil by printing, has a diameter of about 1 mm, and can be moved by automatic control each time so that the target mark 11 is located directly under the photographing section 3, that is, the camera. ing.

Reference numeral 2 denotes an image processing unit, which is an image for performing arithmetic processing such as binarization on video information (video information of a grayscale image signal) converted into a digital signal by an A / D converter (not shown). A processing circuit 12, an image memory 22 for storing the binarized data thereof, a central processing unit 32 for executing a predetermined program, a storage unit 42 for storing necessary data for the central processing unit 32, and the like. And above target mark
The 11 grayscale image signals can be binarized by the image processing circuit 12 and written in the image memory 22.
Reference numeral 4 is a monitor.

In the above-mentioned apparatus, the central processing unit 32 is controlled to execute the feed amount correction program of the X and Y axis feeding mechanism 5, and the moving mechanism (so that the target mark 11 is located directly below the photographing unit 3). After moving the printed circuit board 1 through (not shown), the center of the target mark 11 is measured by a predetermined means, and the punch 6 is moved by an error amount from the measured center of the target mark 11. The X and Y axis feed mechanism 5 when the center of the target mark 11 and the center of the perforator (drill) 6 are aligned by finely moving (correction movement) in the X and Y directions via the X and Y axis feed mechanism 5 It is possible to correct the feed error of the bolt screw (not shown) or the belt (not shown).

FIG. 3 is a flow chart showing the feed amount correction program.

Next, a method of correcting the feed amount of the feed mechanism for the punching tool by the image processing of this embodiment will be specifically described with reference to the monitor 4 screen shown in FIG. 2 and the flow chart of FIG. Since this feed amount correction program measures the feed error amount of the X and Y axis feed mechanism 5 and investigates the correction ratio between the theoretical value and the actual value in advance, what is perforated is a plate material that can be perforated. May be used. First, a hole 0 is made at the origin temporarily provided in the plate material to be punched, the center of gravity of the hole O is measured, and the hole O is made.
The center of is calculated and is temporarily stored in the RAM which is the storage unit 42. Next, the plate material is moved by ΔL via the X- and Y-axis feed mechanism 5, and the hole A is drilled at that position. Then, the center of gravity of the hole A is measured to obtain the center of the hole A, which is stored in the same manner as described above. Next, the correction ratio between the theoretical value L of the center distance between the holes O and A (theoretical distance between target holes for drilling) L and the actual movement distance l of the drilling tool (drill) 6 is calculated (calculation formula). : Movement instruction point x (L / l)), this is the storage unit
Store in 42. Further, each of the holes B, C, and D is drilled while moving in the same direction or the opposite direction by the amount of ΔL, each center is obtained by measuring the center of gravity in the same manner as described above, and each correction factor is calculated according to the above calculation formula. RAM which is the storage unit 42
Stored in the X, Y axis feed mechanism 5 as a control means X,
It is used as a parameter for the Y-axis driver circuit 7. That is, hole A and hole B (hereinafter referred to as AB), hole 0 and hole C (hereinafter referred to as BC), hole O and hole C (hereinafter referred to as OC), hole C and hole D (hereinafter referred to as CD). The correction ratio between the theoretical value L of the center-to-center distance from each of them and the actual movement distance l of the drilling tool (drill) 6 is calculated according to the above-mentioned calculation formula,
This is memorized at any time. Although not shown in the flow chart, the correction ratio between the theoretical value L of the center distance between the holes O and B and the actual movement distance l of the drilling tool (drill) 6 is 0A above.
It is obtained by adding the correction factors of AB and AB and halving, and the theoretical value L of the center distance between the holes O and D and the drilling tool (drill).
The correction rate of the actual moving distance 1 of 6 is the above OC and CD.
It is obtained by adding the correction factor of 2 and 2 minutes.

Therefore, the perforation tool (drill) 6 is finely moved (corrected) in the X and Y directions via the X and Y axis feed mechanism 5 by an amount of error from the center of the measured target mark 11 to make the target mark 11. When the center of the hole and the center of the drilling tool (drill) 6 are matched, the center-to-center distance ((O
A) (AB) (OC) (CD) (OB) (OD)) The correction means based on the theoretical value L controls the X and Y axis driver circuit which is the control means 7 to control the X and Y axis feed mechanism. 5
The target mark 11 by operating the drilling tool (drill) 6
Is moved to a position right below the center of the target mark 11 and is raised through a Z-axis feed mechanism 8 including a solenoid and an air cylinder to punch the center of the target mark 11.

Although the hole intervals of the above (OA), (AB), (OC) and (CD) are constant, the fine movement (correction movement) of the perforating tool (drill) 6 itself is a small amount (about 1.5 mm). Therefore, it is set from 0.2 mm intervals to 0.5 mm intervals. Assuming that the larger the fine movement (correction movement) of the perforation tool (drill) 6, the larger the error movement of the X- and Y-axis feed mechanism 5, the measurement is performed between the above (AB) and (CD). It is also free to add a point so that the correction factor can be obtained from a larger number of points, and further, an E point and an F point are provided outside the B point and the D point to form the center of the target mark 11. Of course, it is also possible to deal with the case where the amount of error from the center of the punch 6 is large. In addition, in the present embodiment, the case where the perforation target portions are provided at regular intervals on the diagonal lines that intersect the origin is described, but the perforation target portions are regularly spaced on the cross line or the radiation that intersects the origin. It is also optional to provide the correction factor with directionality as a parameter by providing it in advance. By doing so, it is possible to select a suitable correction rate from the direction closest to the error direction of the punch 6 with respect to the center of the target mark 11, and it is possible to further increase the correction accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus that implements a feed amount correction method for a punching tool feed mechanism by image processing according to the present embodiment.

FIG. 2 is a front view of the monitor screen showing the relationship between the monitor screen and holes O, A, B, C, and D.

FIG. 3 is a flowchart.

[Explanation of symbols]

5: X, Y axis feeding mechanism 6: Drilling tool (drill) 2: Image processing section 3: Imaging section 4: Monitor 22: Image memory 7: Control means (X, Y axis driver circuit)

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 1/411 9070-5C

Claims (1)

[Claims] 1. A hole is punched each time the origin and the punching target portion are punched by a punching tool which is attached to an object through an X- and Y-axis feeding mechanism and which is attached to a target from a given origin at a fixed interval and moves directly below the punching target portion. Is photographed by the photographing unit, the grayscale image signal is binarized by the image processing unit, the binarized data is stored in the image memory, the binarized data is stored in the monitor screen, and the binarized data of the binarized data is stored. The center of gravity is measured to measure the center of each hole, and a correction unit for each of the theoretical correction distance between the theoretical distance between target holes and the actual movement distance of the punching tool between the holes is stored in a storage unit that stores a predetermined arithmetic expression. Each is calculated based on the calculation formula of
A method for correcting the feed amount of a feed mechanism for a perforation tool by image processing, characterized in that each correction factor is stored and used as a parameter for the control means of the X and Y axis feed mechanism.